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    SubjectRe: [RFC 11/26] tmpfs white-out support
    On Wed, Aug 01, 2007 at 04:13:46PM +0100, Hugh Dickins wrote:
    > On Mon, 30 Jul 2007, Jan Blunck wrote:
    >
    > > Introduce white-out support to tmpfs.
    > >
    > > Signed-off-by: Jan Blunck <jblunck@suse.de>
    > > ---
    > > include/linux/shmem_fs.h | 1
    > > mm/shmem.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++
    > > 2 files changed, 55 insertions(+)
    >
    > I see there's debate about whether this (and its fellows) give the
    > right semantic to whiteouts; and I've not begun to think about that.
    >
    > But as a patch to tmpfs for what you're trying to do, it looks just
    > about fine. I say "just about" because the reference counting looks
    > right, but I wouldn't dare say that it _is_ right without testing.
    >
    > And I'd probably want to add a minor adjustment, so that a mount with
    > nr_inodes=1000 could still support exactly 1000 inodes, despite your
    > allocating one for the whiteout (usually never used) at mount time.
    > But that can follow along later, no problem.

    Also, you might want to make sure whiteouts work with ramfs, which
    replaces tmpfs when tmpfs is disabled.

    --
    Mathematics is the supreme nostalgia of our time.
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